/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

package org.drools.core.common;

import java.util.Stack;

public class UpdateContext {

    private Stack<BaseNode> visitedNodes = new Stack<BaseNode>();

    public void startVisitNode(BaseNode baseNode) {
        visitedNodes.push(baseNode);
    }

    public void endVisit() {
        visitedNodes.pop();
    }

    public boolean isVisiting(BaseNode baseNode) {
        return !visitedNodes.isEmpty() && visitedNodes.peek().equals(baseNode);
    }
}
